Why BIGG Change?

Start of a new era.

We are the first generation to feel the effect of climate change and the last generation who can do something about it.

- Barack Obama

An industry that needs to become greener.

Construction: a climate killer

As one of the main contributors to global warming, the construction and real estate industry causes over 38% of energy-related CO₂ emissions. Although market participants have increasingly recognized the problem, the issue of climate change has played little or no role for the majority in their day-to-day business to date.

High demand for information on green building

Nevertheless, the demand for lectures, discussions and expert exchanges on the subject of green building is growing steadily. Almost the entire industry is looking for concretely usable information and ideas on how to implement sustainable building in practice.

That's why Bigg Change!

We offer a platform for pioneers in green building

Our goal: to make sustainable construction the new standard in the construction and real estate industry as quickly as possible.


Experts from German-speaking territories and around the world who have already initiated sustainable changes and developed technologies provide comprehensive information and motivation.


Exchange and discussion on the topics of sustainable construction, climate protection and green building in order to initiate nationwide changes as quickly as possible.


Against a unique backdrop in Berlin, we're developing Germany's capital into a cluster for environmental and climate protection in the long term, enabling effective change.

Bigg Change:
From the drawing board to Reality.

What started as the idea of Berlin sustainability pioneer Torsten Nehls, henceforth unites building innovators and doers of various stripes in the name of more sustainability. With over 30 years of experience in the Belle Epoque Group as a specialist in real estate management and construction technology, architecture, space and material optimization, recycling and cradle-to-cradle, Nehls is a true pioneer for a greener future in the construction industry.

Torsten Nehls, Initiator BIGG

Bigg Change + GreenTech Festival: together we change!

With its focus on innovative sustainability solutions, the international GREENTECH FESTIVAL, which will take place for the fourth time in 2022, provides the optimal setting for the premiere of the BIGG Change Conference. We are proud and honored to present the BIGG Change concept to visitors for the first time under the umbrella and in partnership with the GREENTECH FESTIVAL.

June 23-24 2022

This is BIGG Change.
Be inspired.

Explore the BIGG Change Conference and become part of this unique event today.

Thu, 23 - Fri, 24 June 2022

BIGG Conference

Thu, 23 - Fri, 24 June 2022

BIGG Exhibition



Book your ticket today

It doesn't get any greener than this: a GREENTECH FESTIVAL ticket grants you full access to the BIGG Change Conference! Simply book any GREENTECH ticket in the ticket store and look forward to two unique events. What are you waiting for?

We're here for you .

Whether exhibitor, speaker, partner or visitor: we are ready to answer your questions.

Contact person:
Michaela Brandenburg

Press and media:
Stöbe Communication
Martin Hoffmann
M: +49 162 943 40 24
T: +49 30 81 61 60 330